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How do I check/ test heater control valve on 1991 Lincoln town car Cartier ?

(1991 Lincoln Town Car)
in Glen Saint Mary, FL on September 17, 2012
Ac starts cold then warm then cold, blend door free and seems to work.
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Popular Answer
on September 18, 2012
It is a vacuum operated valve that you can manually open with a vacuum pump to test operation.
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